Experience 7 (Source)
From SWGANH Wiki
Mission difficulty on starter planets is determined by your skill with the currently equipped weapon, you can get varying levels of difficulty there. (I get around 23 on Naboo, currently).
Mission difficult on adventure planets is often a set range, regardless of weapon. This includes Dantooine, Dathomir, Yavin, Lok and Endor. Some of those are on the lower side (Lok, Yavin) while some are on the higher side (Endor, Dantooine).
